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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cea45cc768ed93db3b8ea683fc8fdd318fd17d13a0f5b93a23f7bc4e958ffef4' 
  AND token = 'yTJK/MBmJaRqFRiwQjeNMTkci55n5QaWzwwcd0qqUoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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