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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baac1e0d71885b598aae2c48e64ce1bec32ca05079086070e85a1fb9db42661c' 
  AND token = '3yOHJgqGy2DEa2cctOfV11he4CpGM6QK6VsyCxA+X2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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