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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afcde9466db797055536665cd2d6df78e89a38bcf3838a4a4009c05b533e54d7' 
  AND token = 'D5o0HmjV0/2YibkB4eHi/nKRubr4KyoD3ae12a2emaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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