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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7818d6e1a950fa0230a24caaa3011eb7fa199a90b764ad1daf0bc03473b31a76' 
  AND token = 'fawYiOl7eJdKg9jVA+9kq1wLXL3O6JM4azlp6aK25r8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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