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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efadfc6a1b94f66075b02f2e07a947c55069535a05dff6ec736c60be5dfa793f' 
  AND token = 'nos+dxqK/YSUoMW8+Pc9moel1h87la9F74pUh/bpkh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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