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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4c47a4ff9cdbe25c3fbb89c72e599701681dd3102202b788fc6d88e1fbd167c' 
  AND token = 'Oh3UMqeyBZJnku6kTX6Gckc4pZM4xkjcERRxAucR3iY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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