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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fa121e36a8dc26447b03d49330f1c8ff7eac6c3ab3eaed584865fa952f3e424' 
  AND token = 'rtO2oHoi6ZNe7ifFPstZ9xwIVDpTKsiQ+8dTct3Hxdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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