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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a862cbc7a93191c228f68d823b901ac1c104550e3abb64d057bba332def3cff8' 
  AND token = 'djr8BQn4Ohapr6s2Q4xUwEZnNapJ49eluUlHEV9ULew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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