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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79a31f5051464193decfe7c52caef07feccc5a0d959c192d5eb8249b8d1b90b7' 
  AND token = 'hu09AFBLmGB3HUGsu3okMy6ArK5nDLv2hJv8tLfkmUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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