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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd00384af2dd467c0b0e45c59b19be66d8bde115b542e89f55bb878e98ce21971' 
  AND token = '4M9HjkPxOgoxnhL1wZF/AZ7Kg3ErwX9O7wZCjOrnf8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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