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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8cc5b8ed1f5969d4f70baa36c8cbaf4209aaab62e5295ffe1103dadb152b78d' 
  AND token = 'X2wJjHfB29Ezpu07qdCkzzI6LZMzaZw70p8GrQ299MM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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