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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa401b155aff8eae86ea36c219883e4802f54c909e8366bda9f6dc19b07402f3' 
  AND token = 'Dp9J8FVufgbbnd80wc6uC9j6gtSofV147liApzexYPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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