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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a308b1390db7808837a4f8068eea6cc2fc40878c02fdc93784d218dfcc594e23' 
  AND token = 'dmr9TI7i9YeoAEJYBCWk1ASO6rpZ/0ECIYufWvwm/Qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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