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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f60c3a94cc987fe716664fe0170f51828231eb5b26e1d59bb35fc9baa945a31' 
  AND token = 'P/3rCZl1AZjoz4DR8t3xzOUqShXlYbY0mWW24k6/uFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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