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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2142250ab1f2e6fd64e6458f2f765ae69e47ccc7aa0acd300789920dae84b8d' 
  AND token = 'XrvmB9aCRNYdk9L4oYfvI1yo1ELGykbtVvtYdlGq7u8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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