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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3aeb700fad4f5fa9cfffdc65dcb6b4097be41237ba06ce86d55f901718adc9d' 
  AND token = 'alHQm0PJxWQtcTJS1yVWkM6AfiHDNQKHc3cDZ/LpD90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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