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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f711ba19cb12e16ba0ce958a40d89756f52a88628076b535b0b3479832681f6' 
  AND token = 'NoCV6tc/wO1+PXQIIVz+38vGbh+1aeqeJ16Wt0JRoVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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