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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb969e6dd68415d2403983984d4227ff50edd7f284f7851dd20e76ddd3441ad2' 
  AND token = 'QNpj5LUP79GQeW1lGFEEZN0IeIETD/2dxhxbpxuggps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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