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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71c59853b7ff2c98887d1c9d16a3d4fc7b00c3eb95dd90e5116213cbbcdc9f43' 
  AND token = 'nWJGTsv/ksyzve9H0KK0c5rGsK09kDZNljGv3e0ny7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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