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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ef1bd07503ebc5f20a182b97a0502d7fe192edd1fa779e06ec00cc2b6a34013' 
  AND token = 'rsCAju0Lou/u447b3HJl4dnAFvpCd/QUPe91VoVX/wA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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