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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2581fbca6846b0273b3be517ec84259948602cb76bb03c8ad4745e60aae98d73' 
  AND token = 'cHzdHPAoHvKzAM5tMkf3rbqKRp4EcgRf7sxsd0mw/J4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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