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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '039415ce44e18a55e41c58a1280f9ae658dcba18a5f1ba919363ba3d1e54fa8b' 
  AND token = 'iQ2pqULGT3rk5lCg16j4rTJP7hycYmIB1/hoNaNZQS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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