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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b82c94df41b9e224eb905021f324579d2a9b646986582010dcf7adc84b72fa1f' 
  AND token = 'Cp1T5mSkvueXEZi9q/r5m4edi+7+ZRaurxYWMvjQtwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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