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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66b1eb61eed5119ebdd593ffbba664b0b8fda1caa973f7941c87c4da79473aea' 
  AND token = 'R0+n0KLfhWDyPejwxW3nH9AU61ryCT+JXEj31Bi5Zqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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