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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd92dd648621650f361e89e7a4b190c94c01de466fdb4dd67e237834f76fe267e' 
  AND token = '76lB+RxOOXcJoTJSIGiDjBSc04FRBG5M9i1+YJrd4iA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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