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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b59ea917232438efc446585173718aac0c2f1f077bb25548b3e844de8c23a68' 
  AND token = '/rwnlBTNOBllwFVbJ27rHAtVODhY9/pkXynb5h3N6ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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