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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ad4f5dbb91cc5ebd93a7d86ebacb214cbf817d70b6735a38345db7f670ba3de' 
  AND token = '8WV0GPY17IgHMk/3AwQkv7ap8fD6xErUQnCz5CYSR34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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