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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55ba28fc7a00189f53786d783aa9936090083d8a2c183e056f81af6320dd09ea' 
  AND token = 'Dn9cDTYrlntWMwxI9Mr/9Bv3uGEZlgtiwuZMJPuUzKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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