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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aeb76efffc7bf8b174e8cacf021bd9cf3b6889c607118e585428867d53766fc' 
  AND token = 'H9LPqx3Yc+ivSZM34irxBfpcqWL7Em9TJC0OSPzJLP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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