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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f4404fce0cad9bd33c0f46bb81dce1509c51df441de49d85982f45cb86d003f' 
  AND token = 'z8dhVNrHd4QbQEK0cbA6sWRgkm1R7AOBvnwECgdfNZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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