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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '738670e2b4efb12e6988f70613216cb48a12c6d1be92eb2e7755269ca73a09b1' 
  AND token = 'VmPZN4WjJ5/eAd5YDSgA7Ha0VthtBrHCea4t3O1Ow2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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