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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7499ea29e811a63c2b4e33d0a1d7f795802ecd5b13a5c82df20abfe303a6147' 
  AND token = 'zMd7TiceEps55jajMP5hpp5w7d+U/q+wbYrju8BGwuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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