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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0e231c5dd3d782843fddafe896f41aaf437fa50d7df1217728f2b04935a7d8d' 
  AND token = 'BUfObP20oSiXGRYML/Zy1fbIX4A7qo/IflCQj25h3pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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