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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eb0b16e5c4e6e942cff7405dfb43737f592ea8a52cc138f1d352504224449e6' 
  AND token = '7b01oq7XCNthPyO5UuzufRUwe6GkJe5yrA7iyWScD7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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