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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36dee18249919bcca4c6e5ed9c0c9372ac7f20301bbe517d97af2162de381db1' 
  AND token = 'hZdQhUlcssGhF8E5oBr8dyE9eZaMp7CMvBye4gjGWnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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