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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab6b9b7f7cdf86a6a27c6064666c01f28556c02a032185df82650e3e8698a92c' 
  AND token = '9TuAfrkPMgJQgqLvpZY33mMNa8/PbAOCbdoxyHh2MFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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