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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd93e6749ed35f32d98aff91bd3198b522d5c53d0205be4db99c66becb25ef919' 
  AND token = 'MhDHuXI+EQGQ43QLyNsGZ6zQD5c4HJWxfcTG1m04D8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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