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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd51bd4d21a0166fde2cf8842655df59a003962b5920776ce4a52c7da8c3027d9' 
  AND token = 'VC85zdK5sUcljiKUniBljfFoiWEdTIX99SfNEd98zP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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