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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7474ff6789d84d96cb2f4fcdcf1215ddf1bda8ecc9010a19ad183ec8dc01c22f' 
  AND token = 'x9wkwmQY/IIMwBOzpWdbbXBfpTyr8bamSK6rQ7evPl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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