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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df8e03b93b2edd231515867170aa982dc264ce905c0f01cb6c0f8ce7c9a8fbdc' 
  AND token = 'vBGQ1yp8zh1x6wBy25SSm1+vavXf7mbAyQtpPC7Bo8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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