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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db9e295677633978a0b7a4a6c3b7d8e68c19a437bb84a7906a4287a1de2762a3' 
  AND token = '+0knfWAz9AXU/ySZRZIJDAQrfMaFfmzqA51Fa5at3Cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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