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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6af0da4afa3800b87032cc6e04591579187b9585b7426060ccbe2aef99e8bce9' 
  AND token = 'PDjbUp/BaP6aueW9darcbDcWKMtqanwgiKAnmc/h7gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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