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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a1276261b857c7eaaacb45f485e5c077fe4bb0a6a852495af0a857227178858' 
  AND token = 'DbrK6lMGMiuE/wZgFAFiEr61f5vW7TJ1RA1fAf8N86c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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