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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e27a049a97cc2c9d895465b03ff2dbffec7813b7350b6c312268f131286cb8f' 
  AND token = 'Z8GZgr+waOD2kLQ7Opg3KiL0CkI0K+yx19lWDze2rJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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