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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19bb86efccc8fe68c9eee8beb4455873288503a05fd3c3ac0c251e5583505fa9' 
  AND token = 'SieghW6J72Ym01pQbr/E8kd93KNg15OPguFBiiXUdog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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