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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4a6463325e41f357d3ed7e16ebd5ad510e146bebcfa1416e4d608916953854b' 
  AND token = 'xdP0xhOMvdUW68HMio5I96ho9MdOukOIb+Mdh6rDx3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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