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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bf858a9a32a144eebe371fc2b26af0867b212b42bb32129d2ef47b7207edcad' 
  AND token = 'geV91vTmkQ4hEr11QZMzOX5x+oMs3f+C5lyy2OygTrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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