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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1ac563926ba73a1fcc75b91b852d847301c2496a5c25e2ec42abe8e5506664e' 
  AND token = 'yQtI0trx7rR86pRpRPFuPQj4s3k+eboPGk+dssCuSAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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