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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '234ea9139819dfcd181990bf1b49a1b881f3cc71ee3a90e9d7e58034f4e4078e' 
  AND token = 'RW53Tgkjl3GphDG94IlGJfIei15l4747+ShyAzQ+YTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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