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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c879dd90dccefaf82bf9578311543cf3c724a137045a7dbd4860c909842f5dcb' 
  AND token = 'F0z/UOi1H82+8r+EJijGL7rl8i5tnv3EnMyf3GNFe+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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