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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd0e5243bd3a17b1d1648bb469bba4ffa24388b18a72c5c54c020775e10e34a4' 
  AND token = '7NLYWY60lxbN+a2EHT25/Sa4+OQwTgQsGeq9PuNcgg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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