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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57685386c9889ad9c3e3121e1cd9a0a3f7c663ce6b35790f9102378ea6eef850' 
  AND token = 'ymdoKArtXAkhaC7Xs9qIIj8Q4mdTqtLTiv38ryk03aQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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