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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3819c1e827dd23f53509562120313e1e8310a54f1131198b2b7886afb85dee7d' 
  AND token = 'osGQBfwFh6P6ZFcl9pP1OOHyqx/G6sxSSzkGKq2TU50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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