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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dfff5277506381a7dc88485ce34c75854c742d4700fd0777c97f15fb0721e7e' 
  AND token = 'WDdcvl7gqSbeAAw7d8157e60KlKXC1wb+3QqxFtSsHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}