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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4404f53923f317171f8986136e4c6f2e74b10c3fcd03ff5ab6a5eeb7a488f292' 
  AND token = 'U76YC7E1SvTsagalZbcKij2yOzAthxjaqeEBx/0yYHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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