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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3faa068733d9e983016a8c9218f0381a9547d7a9d3c65e3d1ffa8e34fabb86b0' 
  AND token = 'urCRPbB1x3+h0fpSXRUHmrV+7uT/7+mCD/mVJL/Y1X0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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