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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fc6f4224c38cfa6983873240c72572b1f34bac8ea5cab592d273ac95de15e07' 
  AND token = 'naJyv8hjc62HFU8SPru54RM3uCg2U9JCFblJUWhDv/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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