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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '164ca477404da5f3c14630013d1fd2de451405cba88d33f8cbd5cdb5d6ba08d4' 
  AND token = 'WR0rE37D3IKdhSQub3x1gzAXBRpw12O1RIEbshqYM4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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