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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14f20018daff3f5bc36a95f0ae867e5012998292fc71dc0c3d18a2b3a7c6104d' 
  AND token = '6krH5WmhodSNp+lvrXPfLSxJxXQkH/6iPeH9miOpN48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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