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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faca97b45e87658ebcf72c963df5d19c4295274e97fa3978751e7127c6c0de11' 
  AND token = 'xfIDZj3OnFVUO5LLggB0vicNz9gZ9ebHA+zzOGNIDrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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